Sign of danger after tea's spilt (8)
I believe the answer is:
asterisk
'sign' is the definition.
(asterisk is a kind of sign)
'danger after tea's spilt' is the wordplay.
'danger' becomes 'risk' ('risk' can be a synonym of 'danger').
'after' means one lot of letters go next to another.
'spilt' is an anagram indicator.
'teas' with letters rearranged gives 'aste'.
'risk' after 'aste' is 'ASTERISK'.
'of' is the link.
(Other definitions for asterisk that I've seen before include "Printer's star" , "Star-shaped character used in printing" , "Star-like symbol as reference mark" , "Sarkiest (Anag)" , "star-shaped figure" .)